Hi. So I've had enough of the optical HR now on the 235. Trying to follow a heart rate training plan and the sensor is either telling me I'm not even in the easy zone when running flat out for several minutes or that I'm in threshold or maximum after a 10 minute cool down. It's wildly inaccurate and I'm so disappointed (bought my 235 a month ago, previously a fitbit user).
So my question is, what chest straps to recommend for the 235? Never bought or used one before so any suggestions would be great. Also how much should I be looking to pay (UK £ please). Thanks!